RT Journal Article SR Electronic T1 Letters to the Editor JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 533 OP 533 DO 10.1136/jmg.27.8.533-a VO 27 IS 8 A1 Hurst, Jane A1 Berry, Caroline YR 1990 UL http://jmg.bmj.com/content/27/8/533.2.abstract AB